const express = require('express')
const { ping } = require('bedrock-protocol')
require('dotenv').config()

const app = express()

app.listen(3000)

if(!process.env.HOSTNAME) throw new Error("HOSTNAME not set")

const template = (status)=> `# HELP minecraft_bedrock_check Information about liveness of target bedrock server
# TYPE minecraft_bedrock_check gauge
minecraft_bedrock_check{server="${process.env.HOSTNAME}"} ${status}
`

app.get('/metrics',async (req, res) => {
   try {
       const hostname = process.env.HOSTNAME
       await ping({host: hostname, port: 19132, connectTimeout: process.env.TIMEOUT ?? 4000})
       res.contentType("text/plain; charset=utf-8")
       res.send(template("1"))
   } catch (e) {
       res.contentType("text/plain; charset=utf-8")
       res.send(template("0"))
   }
})